In your case your wiring is correct, using a test light will confirm this but this is one of the standard configurations for trailer plugs!
your red wire should test out at +12v supply,
green/red wire is right turn and stop,
blue wire IS trailer brake supply,
white wire IS ground,
yellow/red is left turn and stop
brown/white is running/marker lights
black/yellow is reverse/backup lights,
ok, that's your wires and their functions
on the 7 way plug there are color designations, these are for standard North American rv type wiring code
black =+12v
white=ground
brown= right turn and stop
red =left turn and stop
green=running/marker lights
blue= trailer brakes
ylw = reverse/backup lights
ther ya go,put the function to the correct color designation and yer off into the night !!!
hope this helps
CHEERS.......Kev...
Wire Color/Receptacle Marking
Red/Black
Green-Red/Brown
Blue/Blue
White/White
Yellow-Red/Red
Brown-White/Green
Black-Yellow/Center Pin
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